Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 90,000	$ 165,000	$ 175,000	$ 291,000
Effective tax rate			(1.52%)	(1.22%)
U.S. federal statutory tax rate			34.00%
Income tax examination, description			As a result of net operating loss carryforwards, the Company is subject to audits for tax years 2006 and forward for federal purposes and 2009 and forward for California purposes.